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Plant Highlight: Encephalartos horridus

A blue plant with spiky leaves that has a pinecone growing in the middle

February 2017

Encephalartos is a large genus in the Zamiaceae, one of the three families of cycads. Though they look somewhat like small palms, the cycads are actually an ancient group of cone-bearing plants whose lineage extends back many millions of years, to a time when flowering plants had not yet made their appearance on the world stage. Though cycads can be found in various parts of the world, the genus Encephalartos is African in origin. Some of the species with the most strikingly blue foliage come from the southern part of South Africa, and one such plant is Encephalartos horridus, from near the city of Port Elizabeth.

Encephalartos horridus is notable not only for its powder-blue leaves, but also for its stiff, sharp leaflets, whose ability to stab the unwary gave the species its name. This species is not as large as some others, never getting more than a few feet tall, but it ca pine cone with a green moss between each crackan put out offsets and become a large clump in time. Like all cycads, E. horridus has separate male and female plants, but the appearance of the two sexes is identical up until they reach maturity and form cones. When this happens, the females can be readily distinguished by their wider and heavier cones with larger scales. Though the outside of the cone is blue-green to brown in color, the seeds within the female cone are bright red, a trait which can only be observed when the cones mature and break apart.

The leaves of Encephalartos horridus are several feet long and arch outward from the growing point. Each one has a cylindrical mid-rib, with spiky leaflets jutting out to either side. In addition to the sharp point at the tip of eA plant with spiky blue leaves that arcach leaflet, there are one or two lobes lower down which end in equally sharp points. The tips of the leaves usually curl downward, though this is more pronounced in some forms than in others.

E. horridus is a slow-growing plant which can live for centuries, and it is much prized in horticulture for its stunning blue leaves and its dramatic prickly appearance.